Mounting of rotary cutting means for paper, card, and the like



Jan. 15, 1952 J. E. BATTERSBY 2,582,522

MOUNTING OF ROTARY CUTTING MEANS FOR PAPER, CARD, AND THE LIKE Filed Aug. 11, 1948 Patented Jan. 15, 1952 MOUNTING OF ROTARY CUTTING MEANS FOR PAPER, CARD, AND THE LIKE James Eckersley Battersby, London, England, as-

signor to Masson Scott &

London, England Company Limited,

Application August 11, 1948, Serial No."43,637 y In Great Britain August 15, 1947 6 Claims.

ing made, as by supplementary screws, for adjustment of the blade at right-angles to the plane thereof. It is required that the mounting should afford a seating or bed for the rear edge of the blade, i. e. the edge opposite the cutting edge, to receive the thrust due to the cutting action so that this is not taken in shear by the mounting bolts, and the blade must also be drawn into the required helical form. The amount of fitting work hitherto found necessary to fulfil these conditions renders the operation of mounting such blades unduly expensive, and it is one of the objects of the present invention to provide an improved mounting for this purpose which enables the time and labour required for fitting to be considerably reduced whilst ensuring that the rear edge of the blade is properly fitted to the helix and bedded against the seating or shoulder provided for its reception. Another object is to enable blade replacements to be readily fitted with the required accuracy.

According to the invention. the holes for the mounting bolts in a cutter blade for the purpose described are enlarged with respect to the bolt portion passing therethrough, and the bolts are provided or formed with an eccentric portion engageable with the side of the enlarged hole so that by turning the bolt when securing the blade in position the latter may be displaced transversely to bed the rear edge of the blade against its seating. It will be appreciated that the required displacement to be provided for may be quite small. According to a further featureof the invention, the blade bolt holes are elongated in the general direction of the length of the blade and preferably have short straight sides and semi-circular ends, the sides being disposed parallel with the cutting edge of the blade. The eccentric part of the bolt which traverses the enlarged or elongated blade holes may be variously shaped, but according to a further feature of the invention the said eccentric portion is of circular cross-section and has a depth slightly.

less than the thickness of the blade. The diame- 2 ter of said part corresponds to the width of the elongated hole in the blade and is preferably slightly less; In a convenient and preferred arrangement according to the inventionfthe mounting bolts comprise a head, preferably round with convenient flats, a concentric shank portion'of circular cross-section having a threaded extension for the nut, and an eccentric portion of circular crosssection between the head and aforesaid shankand preferably having a diameter greater than the latter. Conveniently the eccentric portion-is aligned or nearly so with theshank at 'one side; A helical face formed or'provided on the drum for receiving the blade is drilled for the'shanks of the mounting bolts which are secured by nuts on the far side of the'part comprisingsaid face,: a shoulder or seating surface perpendicular thereto being providedfor the rear edge of the blade to receive the cutting thrust thereof; It will be understood thatthe mounting holes aredisposed in relation to the said shoulder or seat: ing surface so that by turning the bolts the eccentric parts thereof will force the rear of the blade into engagement withsuch surface. The blade is mounted so that'the cutting edge projects beyond the periphery of the drum and preferably adjusting s'cr'ews' are provided which" bear on the underside of the blade for the-'pur pose of adjusting the position of' the cutting edge. 1 l

In the accompanying drawingsz' Figure 1 is an end view of a drum according to the invention, Figure 2 is a partial elevation of the drum,

Figure 3 is a section showing the improved mode of securing the blade in the drum, and

Figure 4 is a view looking fromthe right in Figure3. e f

In carrying the invention into effect-according to one convenient mode, described byway of example as applied to the mounting of a cutting blade for the purpose described upon a hollow cylindrical drum, the cylindrical surface I of the drum 2 is formed with a helical recess 3' extending longitudinally thereof for the recep-" tionand mounting of the cutting blade 4. The

said recess comprises a surface 5 in a helical plane extending lengthwise of the drum and bounded along one'side by a shoulder or seating surface 6 perpendicular thereto and'radial with respect to the said surface, the arrangement being such that the flat cutter blade 4 maybe received in the recess and will then lie substan-,. tially tangential withjrespect to thedrum with;

its rear edge 1 abutting the aforesaid seatin surface 6, th cutting edge 8 f the blade projecting beyond the cylindrical surface of the drum. The portion 9 of the drum on which the helical surface of the recess 3 is formed is cut away tothe rear thereof to provide a recess l0 affording access to the nuts I] of the holdingdown bolts I2 which pass through holes l3, M in the cutter blade and the said portion 9 respectively and also the adjusting bolts or screws I5. Strengthening webs l6 may be provided at intervals between the overhung portion 9 in which the recess is formed and the remainder of the drum structure. It will be understood that the drum 2 will generally be of hollow construction.

The cutter blade 4 is of fiat elongated plate form having a flat face ll which is drawn against the helical recess surface 5 aforesaid and a rear edge 7 at right-angles thereto to engage the seating shoulder 6 of the recess. The inner surface 48 of the blade which projects beyond the recess may be relieved by cutting away a portion thereof so that this portion of the blade is thinner than the portion seated in the recess. A series of corresponding holes l3 and M are provided in the blade land in the recessed overhung portion 9 of the drum portion to take the holding bolts I2. The holes 14 in the overhung portion 9 are circular and those IS in the blade are larger and elongated having short straight sides I3a parallel to the cutting edge 8 and semi-circular ends. The bolts l2 have round heads l9 with parallel flats 15a and a threaded shank portion 20., betweenwhich and the head i9 is a plain shank portion 2| comprising a concentric part i fitting the hole 4 in the recess 3 and aneccentric part 22 of circular cross-section adapted to fit loosely .in the elongated holes l3 in the blade, the axial extent of such eccentric part being slightly less than the thickness of the blade. The position of the bolt holes I4 in the recess relative to the seating shoulder 6 thereof is such that by turning the bolt 12 the eccentric shank part 22 thereof will bear against the side of the elongated hole I 3 in the blade and displace the latter until its rear edge abuts against the helical seating face or. shoulder 6 .of the recess. The nuts .H on the threaded .shanks of the bolts are then tightened up, the position in which the eccentric parts 22 originally inserted in the blade holes l3 being such that this tightening assists in forcing the rear edge of the blade against the seating shoulder. The round heads [8 of the bolts I 2 cover the elongated holes l3 and an index mark is provided on the head to indicate the position of the eccentric shank part 22.

It will be appreciated that with this arrangement it is not necessary to rely upon exceedingly accurate positioning of the bolt holes with respect to the seating face and blade, since small inaccuracies may be compensated by lateral blade displacement and proper seating of the rear edge of the blade upon the shoulder is ensured.

It will be understood that the form and general arrangement of the drum or equivalent structure upon which the cutter is mounted may be widely varied to suit particular conditions 'or requirements met with in practice.

I claim:

1. A rotary cutter for severing sheets by a progressive cutting action comprising, in combination, a rotatable support having thereon a seating for receiving a cutting blade with its plane in substantially tangential relation to the support and formed so that the blade assumes at least an inclined relation to the axis of rotation when secured to the support, said seating including a shoulder abutment surface for the rear edge of the blade and adapted to receive the cutting thrust on said blade, a flexible cutting blade disposed in said seating and having enlarged bolt holes therein, and bolts passing through said enlarged holes and having nuts thereon for securing the cutting blade to the seating, said bolts each having an eccentric cam portion engageable with the sides of the bolt holes and so arranged that by rotating the bolts the rear edge of the blade is drawn forcibly against the aforesaid abutment surface in such a manner that the cutting thrust on the blade will be taken by said surface and not by the bolts.

2. A cutter according to claim 1, in which the blade holes are elongated in the direction of the blade length and have short straight sides.

3. A cutter according to claim 1, including screws arranged to bear against the overhung portion of the flexible blade on that side of the bolts remote from the abutment surface, for adjusting the blade edge transversely with respect to the blade width.

4. A rotary cutter comprising in combination a rotatable support having a cut-out portion extending longitudinally of the axis of the support and including a seating surface disposed substantially chordally of the support and extending at least at an angle with respect to the longitudinal axis of the support, said seating surface terminating in a shoulder perpendicular thereto, a normally fiat flexible cutting blade including a cutting edge and a rear edge disposed in said cut-out portion, means for mounting the blade to the support including elongated apertures in the blade with the major dimension of each aperture extending longitudinally of the blade, apertures in the said seating surface in spaced relation with respect to said shoulder and headed bolts disposed through the apertures in the blades and surface respectively and said bolts each including an eccentric cam portion adjacent the head and cooperable with the surfaces of the blade defining the respective apertures therein and means for drawing "the bolts against the blades to secure the same in the seatings against the said seating surface and the cooperation between the eccentric portions of the bolts and the surfaces of the blades defining the apertures therein in combination with the drawing of the bolt heads against the blades deforming the blade so that the under surface thereof bears against the said seating surface and the rear edge of the blades forcibly seats against said shoulder so that cutting thrusts on the blade is absorbed by said shoulder only and said shoulder having a height at least as great as the thickness of the blade.

5. A rotary cutter comprising in combination a rotatable support having a first notch extending inwardly thereof substantially chordally of the support and a second notch of greater depth, in substantial parallelism with the first notch and inwardly thereof to respectively define a blade receiving recess adjacent the periphery of the support and a housing recess radially inward of the first mentioned recess, the first mentioned notch having a seating surface lying in a helical plane extending longitudinally of the axis of the support and a shoulder defining the notch and constituting a thrust receiving abutment, the said first notch receiving a flexible cutting blade disposed so as to be in substantial tangential relation with respect to the support and to exert progressive cutting action, said blade being normally fiat and including a rear edge, and a cutting edge, the blade further having elongated apertures therethrough, the axes thereof disposed inwardly of the rear edge of the blade and the major dimension of the apertures extending longitudinally of the blade, the said seating surface having apertures extending therethrough and terminating in communication with said second recess, and headed bolts passing through the apertures in the blade and surface respectively with the inner face of the head in abutting relation with the blade and the said abutment surface being at least co-extensive in length with the thickness of the blade and said bolts having eccentric portions thereon inwardly of the head, and nuts for tightening the bolts against the blade for securing the blade against the seating and said eccentric portions cooperating with the elongated apertures in the blade to forcibly thrust the rear edge of the blade against the said abutment and the tightening of the nuts deforming the blade so that it is disposed in the said helical plane against the said seating surface and the second mentioned recess accommodating the nuts and permitting ready assembly of the blade on the support.

6. A rotary cutter as defined in and by claim 5 in which said blade is relieved to provide a portion of less thickness adjacent the cutting edge and adjusting screws passing through the portion of support between the notches and underlying the said relieved portion of the blade for cooperation with the said relieved portion to adjust the position of the cutting edge.

JAMES ECKERSLEY BATTERSBY.

REFERENCES CITED The following references are of record in the file of this patent:

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